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(OV/5-2) Transport and Turbulence Studies in T-10 Tokamak

M.V. Ossipenko¹⁾, T-10 Team
 
¹⁾ NFI, RRC ``Kurchatov Institut'', Moscow, Russia

Abstract.  Transitions to the improved confinement regimes were studied in T-10 ECR heated tokamak: the H-mode with and without ITB and the pellet enhanced confinement (PEC) regime. It was shown that subtle changes in q profile allows us to obtain either ITB or ETB only, or both of them under approximately similar conditions. H-mode can be obtained by both power increase and pellet injection. In the PEC-mode the averaged plasma density has more peaked profile than in the H-like mode. The confinement time in the PEC-mode is 30% higher than that in the H-like mode. The global confinement in the regime with the density above Greenwald limit under the strong gas-puffing and ECRH was investigated. To identify the type of turbulence responsible for transport, Ohmic and ECRH regimes with variation of q_L and gas puffing were considered. Two regions with different turbulence properties corresponding to ITG or DTE and resistive interchange instabilities were observed along the minor radius.

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